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[Jerome Abela <2079921@xxxxxxxxxxxxxxxxxx>]

In gdk_wayland_seat_get_slaves, here is the entry for the tablet:

$6 = {wp_tablet = 0x55555561ab50, name = 0x55555561c480 "HID 256c:006e Pen", path = 0x555555639560 "/dev/input/event21", vid = 9580, pid = 110, 
  master = 0x555555639270, stylus_device = 0x555555635590, eraser_device = 0x555555640530, current_device = 0x0, seat = 0x55555562a250, 
  pointer_info = {focus = 0x0, surface_x = 0, surface_y = 0, button_modifiers = 0, time = 0, enter_serial = 0, press_serial = 0, 
    grab_window = 0x0, grab_time = 0, pointer_surface = 0x555555624900, cursor = 0x0, cursor_timeout_id = 0, cursor_image_index = 0, 
    cursor_image_delay = 0, current_output_scale = 1, pointer_surface_outputs = 0x0, frame = {event = 0x0, delta_x = 0, delta_y = 0, 
      discrete_x = 0, discrete_y = 0, is_scroll_stop = 0 '\000', source = WL_POINTER_AXIS_SOURCE_WHEEL}}, pads = 0x0, current_tool = 0x0, 
  axis_indices = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, axes = 0x0}

But there is also an entry for its pad:

$7 = {seat = 0x55555562a250, wp_tablet_pad = 0x5555556383a0, device = 0x0, current_tablet = 0x0, enter_serial = 0, n_buttons = 12, 
  path = 0x5555556258f0 "/dev/input/event22", rings = 0x0, strips = 0x0, mode_groups = 0x555555628520 = {0x555555642f20}}

Notice that the device in NULL, but it gets inserted into the list
anyway.

So, it could be:
- a bug in wayland, if the API is not supposed to return a PAD without a device
- a bug in gdk, if it is supposed to ignore a NULL device in the tablet_pads list, but is not supposed to return a NULL in get_slave's GList
- a bug in inkscape, if it is supposed to check for NULL entries in the seat_get_slave's list.

The easiest fix is probably to add a check for NULL in inkscape, in
createFakeList, as it's a one-liner that can't have negative
consequences, and then bubble the bug up to gdk?

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https://bugs.launchpad.net/bugs/2079921

Title:
  inkscape crashes when started

Status in inkscape package in Ubuntu:
  Confirmed

Bug description:
  After a fresh install, no config, no cache, I start inkscape, with no
  parameter, it immediately crashes with SIGSEGV:

  #0  Gdk::Device::get_source (this=0x0) at gdk/gdkmm/device.cc:282
  #1  0x00007ffff782d665 in createFakeList () at /usr/include/glibmm-2.4/glibmm/refptr.h:259
  #2  0x00007ffff782e08d in Inkscape::DeviceManagerImpl::DeviceManagerImpl (this=<optimised out>, this=<optimised out>) at /usr/src/inkscape-1.2.2-2ubuntu12/src/device-manager.cpp:326
  #3  0x00007ffff782e5a5 in Inkscape::DeviceManager::getManager () at /usr/src/inkscape-1.2.2-2ubuntu12/src/device-manager.cpp:611
  #4  0x00007ffff788be22 in Inkscape::Application::Application (this=<optimised out>, use_gui=<optimised out>, this=<optimised out>, use_gui=<optimised out>)
      at /usr/src/inkscape-1.2.2-2ubuntu12/src/inkscape.cpp:215
  #5  0x00007ffff788c608 in Inkscape::Application::create (use_gui=<optimised out>) at /usr/src/inkscape-1.2.2-2ubuntu12/src/inkscape.cpp:142
  #6  0x00007ffff792d6d0 in InkscapeApplication::on_startup (this=0x5555555c0340) at /usr/src/inkscape-1.2.2-2ubuntu12/src/inkscape-application.cpp:993
  #7  0x00007ffff64b5714 in sigc::slot0<void>::operator() (this=0x5555557a1e88) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:540
  #8  Glib::SignalProxyNormal::slot0_void_callback (self=<optimised out>, data=0x5555557a1e80) at ../glib/glibmm/signalproxy.cc:103
  #9  0x00007ffff5e3a2fa in g_closure_invoke (closure=0x5555557a1ed0, return_value=0x0, n_param_values=1, param_values=0x7fffffffc270, invocation_hint=0x7fffffffc1c0)
      at ../../../gobject/gclosure.c:834
  #10 0x00007ffff5e69c79 in signal_emit_unlocked_R.isra.0 (node=node@entry=0x7fffffffc340, detail=detail@entry=0, instance=instance@entry=0x55555577b160, 
      emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffffffc270) at ../../../gobject/gsignal.c:3961
  #11 0x00007ffff5e5a591 in signal_emit_valist_unlocked (instance=instance@entry=0x55555577b160, signal_id=signal_id@entry=195, detail=detail@entry=0, var_args=var_args@entry=0x7fffffffc4b0)
      at ../../../gobject/gsignal.c:3520
  #12 0x00007ffff5e5a7c1 in g_signal_emit_valist (instance=0x55555577b160, signal_id=195, detail=0, var_args=var_args@entry=0x7fffffffc4b0) at ../../../gobject/gsignal.c:3263
  #13 0x00007ffff5e5a883 in g_signal_emit (instance=instance@entry=0x55555577b160, signal_id=<optimised out>, detail=detail@entry=0) at ../../../gobject/gsignal.c:3583
  #14 0x00007ffff567df2e in g_application_register (application=application@entry=0x55555577b160, cancellable=cancellable@entry=0x0, error=error@entry=0x7fffffffc650)
      at ../../../gio/gapplication.c:2352
  #15 0x00007ffff567e4d0 in g_application_real_local_command_line (application=0x55555577b160, arguments=0x7fffffffc6a8, exit_status=0x7fffffffc6a4) at ../../../gio/gapplication.c:1155
  #16 0x00007ffff567e823 in g_application_run (application=0x55555577b160, argc=<optimised out>, argv=0x5555555beb90) at ../../../gio/gapplication.c:2681
  #17 0x00007ffff5c2a1ca in __libc_start_call_main (main=main@entry=0x555555556600 <main(int, char**)>, argc=argc@entry=1, argv=argv@entry=0x7fffffffc818)
      at ../sysdeps/nptl/libc_start_call_main.h:58
  #18 0x00007ffff5c2a28b in __libc_start_main_impl (main=0x555555556600 <main(int, char**)>, argc=1, argv=0x7fffffffc818, init=<optimised out>, fini=<optimised out>, 
      rtld_fini=<optimised out>, stack_end=0x7fffffffc808) at ../csu/libc-start.c:360
  #19 0x0000555555556ee5 in _start ()

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: inkscape 1.2.2-2ubuntu12
  ProcVersionSignature: Ubuntu 6.8.0-36.36-generic 6.8.4
  Uname: Linux 6.8.0-36-generic x86_64
  NonfreeKernelModules: lkp_Ubuntu_6_8_0_36_36_generic_106
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Sep  8 13:36:26 2024
  InstallationDate: Installed on 2024-07-01 (69 days ago)
  InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: inkscape
  UpgradeStatus: No upgrade log present (probably fresh install)

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